To install Skype add the Canonical Partner Repository.Open the terminal and run the following commands:
sudo apt-add-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"
sudo apt-get update
Install Skype on Ubuntu 32bit:
wget -O skype.deb http://download.skype.com/linux/skype-ubuntu_4.0.0.8-1_i386.deb
sudo apt-get install libxss1
sudo dpkg -i skype.deb
sudo apt-get -f install
Install Skype on Ubuntu 64bit:
wget -O skype.deb http://download.skype.com/linux/skype-ubuntu_4.0.0.8-1_amd64.deb
sudo apt-get install libxss1 lib32stdc++6 lib32asound2 ia32-libs libc6-i386 lib32gcc1
sudo dpkg -i skype.deb
sudo apt-get -f install
sudo apt-get update && sudo apt-get install skype